Back when I was playing with laser diodes, I found out which papers bleached. It was not always the ones I thought.
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Sweet!
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That is so cool. That makes all the difference in the world. Thanks for pointing that out. 
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Thanks for sharing! Your dog is completely adorable!
These settings worked a treat for engraving the top cover of my sketchbook. I figured the cover’s top layer had the properties of poster paper and I wasn’t wrong.
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Great design! 
Does it engrave white regardless of the paper color?
I suspect the right settings could darken the core layer or depending on the core material produce a different color.
for example https://www.amazon.com/Darice-Coredinations-Premium-65-lb-Cardstock/dp/B0086XFRTM/ claims to be dyed through the core.
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No, I don’t think so. At that low power the laser is just kind of scratching the surface. 
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